Chicks and beer!!!

[bobbo27]

Now that I hopefully got you in here, I got this physics problem I have to do. It's an online thing, so it will only accept a specific answer.

Antarctica is roughly semicircular, with a radius of 2000 km (Fig. 1-5). The average thickness of its ice cover is 3000 m. How many cubic centimeters of ice does Antarctica contain? (Ignore the curvature of Earth.)

Fig. 1-5
Problem 7.


I've tried every damn answer I can think of, and it won't take any of them. So I'm coming to you guys for help here.

Volume of a cylinder is V = (p)r^2 h
and google tells me 1 cubic kilometers = 1.0 × 10^15 cubic centimeters

So... V = (p)(2000^2)(3)(1/2)
18849555.92 cubic kilometers. Right?
so that's 18849555920000000000000 cubic centimeters?

It says that's wrong.

Can anybody figure out what I might be doing wrong? Feel free to call me a retard.

[ILoveRCRockCrawlin]

Why don't you just find the surface area of the top of the semicircle then multiply by 3000m. but first conver km to m.

[ILoveRCRockCrawlin]

Wait thats basically what youre doing, but be sure to conver km to m.

[bobbo27]

Yeah that's what I'm doing. Except it's km to cm.

[ILoveRCRockCrawlin]

ok heres what i did

find the area of the top of the circle.

So if area equals pie radius squred , then area equals (pie)2000000m(squared). Remember exponents first, so it would be (pie)4000000000000. So then do pie and you get 12566370610000 then multiply by the 3000 and get 37699111850000000m

[ILoveRCRockCrawlin]

I think I see what you're doing wrong. You're dividing it in half. Radius is half the circle so you dont need to divide it in half.

[or,crawler]

YOU SUCK. No more putting ''chicks and beer'' unless it is '' Chicks and beer''

[ILoveRCRockCrawlin]

Hey bobbo try multiplying your answer by 2 and you'll get what i had, just a different amount of zeros.

[bobbo27]

Originally Posted by ILoveRCRockCrawlin

I think I see what you're doing wrong. You're dividing it in half. Radius is half the circle so you dont need to divide it in half.

"Antarctica is roughly semicircular"



lol @ or,crawler - I figured the title would get some people

[ILoveRCRockCrawlin]

yeah i know but that diagram is giving you the radius, not diamiter, there for you do not need to divide in half for the radius. Just try my answer and see if its right.

[OIT_TLT]

Originally Posted by ILoveRCRockCrawlin

yeah i know but that diagram is giving you the radius, not diamiter, there for you do not need to divide in half for the radius. Just try my answer and see if its right.

yes you do, see pi(r)^2 is the area of a FULL circle, so to get half that you must multiply by 1/2 and that is the area of a semi-circle

[ILoveRCRockCrawlin]

Originally Posted by OIT_TLT

yes you do, see pi(r)^2 is the area of a FULL circle, so to get half that you must multiply by 1/2 and that is the area of a semi-circle

DAMN!

[OIT_TLT]

after thinking about it for a few minutes, i say you should cut a hole in the ice and kick your teacher in the icehole for making you figure out such a moronic problem!

edit: try 18849555920000000 and see if that works. i converted everything to meters first, and then converted that answer into cm. i just used conversions that i knew would work, instead of relying on information given on the internet.

[flexntj2001]

I came up with 36" x 24" x 34" + 12 = BABY

What do I win!!!

[JohnRobHolmes]

Originally Posted by flexntj2001

I came up with 36" x 24" x 34" + 12 = BABY

What do I win!!!

HAHAHA!!!!


you win 18 years of child support, thats what.

[JohnRobHolmes]

so are you doing a proper conversion of km^3 to cm^3? your not just multiplying by 100,000 right?

just checked your answer. looks like you moved the decimal 15 places for the conversion, which should be right. I didnt check your math, but it all looks good to me. I say the answer key is wrong.

[FrankyRizzo]

No tech or chicks here.

My brain hurts I am going to get another beer.

[Madcratebuilder]

Originally Posted by johnrobholmes

HAHAHA!!!!


you win 18 years of child support, thats what.

It's paid in full.

[TLTCrawlin]

This thread sucks.. I wanted chicks and beer not nerdly work..

[TMXONR]

This might be wrong, but here goes. Antarctica has about 7.2 million cubic miles of ice, there are 160,934.4000006 centimeters in 1 mile, so wouldn't (160934.4000006)^3 equal the amount of centimeters in 1 cubic mile?
(7200000)^3(160934.4000006)^3 = 1555765529999446190448617317822400000
so thats 1,555,765,529,999,446,190,448,617,317,822,400,000 cubic centimeters of ice

dang, thats like 1.56 undecillion cubic centimeters